package zy.blue7.gui.netty.learn.http;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.*;
import io.netty.util.CharsetUtil;

import java.net.URI;

/**
 * @author blue7
 * @version 1.0
 * @date 2022/2/25 16:58
 */

/**
 * 说明：
 * 1. SimpleChannelInboundHandler 是 ChannelInboundHandlerAdapter
 * 2. HttpObject 是客户端和服务端相互通信的数据被封装成 HttpObject
 */
public class TestHttpServerHandler extends SimpleChannelInboundHandler<HttpObject> {


    /**
     * 读取客户端数据
     *
     * @param ctx
     * @param msg
     * @throws Exception
     */
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, HttpObject msg) throws Exception {


        /**
         * 判断 msg 是否是 HttpObject 请求
         */
        if (msg instanceof HttpRequest) {
            System.out.println("msg 类型=" + msg.getClass());
            System.out.println("客户端地址：" + ctx.channel().remoteAddress());

            /**
             * 获取到
             */
            HttpRequest request = (HttpRequest) msg;

            /**
             * 获取uri
             */
            URI uri = new URI(request.uri());
            if ("/favicon.ico".equals(uri.getPath())) {
                System.out.println("你请求了这个资源， favicon.ico  不做响应");
                return;
            }


            /**
             * 回复信息给浏览器 【http 协议】
             */
            ByteBuf content = Unpooled.copiedBuffer("hello，  我是服务器", CharsetUtil.UTF_8);


            /**
             * 构造一个 http 的响应， 即 httpResponse
             *
             */
            FullHttpResponse response = new DefaultFullHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, content);


            response.headers().set(HttpHeaderNames.CONTENT_TYPE, "text/plain;charset=utf-8");
            response.headers().set(HttpHeaderNames.CONTENT_LENGTH, content.readableBytes());


            /**
             * 将构建好的 response 返回
             */
            ctx.writeAndFlush(response);
        }
    }
}
